From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Davis Herring" Newsgroups: gmane.emacs.devel,gmane.emacs.pretest.bugs Subject: Re: creating backups in temporary directories Date: Mon, 10 Sep 2007 12:18:36 -0700 (PDT) Message-ID: <37852.128.165.123.18.1189451916.squirrel@webmail.lanl.gov> References: <85sl5q5vy6.fsf@lola.goethe.zz> <87y7fii7bz.fsf@gmx.de> <85odgbobf0.fsf@lola.goethe.zz> <85bqcbnx30.fsf@lola.goethe.zz> Reply-To: herring@lanl.gov NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: sea.gmane.org 1189458787 7633 80.91.229.12 (10 Sep 2007 21:13:07 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Mon, 10 Sep 2007 21:13:07 +0000 (UTC) Cc: rms@gnu.org, Andreas Schwab , Stefan Monnier , emacs-pretest-bug@gnu.org, christopher.ian.moore@gmail.com, svenjoac@gmx.de To: "David Kastrup" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Sep 11 07:12:53 2007 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1IUwHC-0005Vx-Ex for ged-emacs-devel@m.gmane.org; Tue, 11 Sep 2007 05:18:58 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1IUomp-0003hX-Nx for ged-emacs-devel@m.gmane.org; Mon, 10 Sep 2007 15:19:07 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1IUoml-0003hI-Er for emacs-devel@gnu.org; Mon, 10 Sep 2007 15:19:03 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1IUomk-0003h6-9T for emacs-devel@gnu.org; Mon, 10 Sep 2007 15:19:03 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1IUomk-0003h3-4A for emacs-devel@gnu.org; Mon, 10 Sep 2007 15:19:02 -0400 Original-Received: from fencepost.gnu.org ([140.186.70.10]) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1IUomj-0007WR-Pu for emacs-devel@gnu.org; Mon, 10 Sep 2007 15:19:01 -0400 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by fencepost.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1IUomM-0004Fg-Jy for emacs-pretest-bug@gnu.org; Mon, 10 Sep 2007 15:18:38 -0400 Original-Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60) (envelope-from ) id 1IUomg-0007VY-4M for emacs-pretest-bug@gnu.org; Mon, 10 Sep 2007 15:19:01 -0400 Original-Received: from mailwasher.lanl.gov ([192.65.95.54] helo=mailwasher-b.lanl.gov) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1IUomX-0007T5-Tk; Mon, 10 Sep 2007 15:18:50 -0400 Original-Received: from mailrelay3.lanl.gov (mailrelay3.lanl.gov [128.165.4.104]) by mailwasher-b.lanl.gov (8.13.8/8.13.6/(ccn-5)) with ESMTP id l8AJIe8u015709; Mon, 10 Sep 2007 13:18:40 -0600 Original-Received: from webmail1.lanl.gov (webmail1.lanl.gov [128.165.4.106]) by mailrelay3.lanl.gov (8.13.8/8.13.8/(ccn-5)) with ESMTP id l8AJIb1c025487; Mon, 10 Sep 2007 13:18:37 -0600 Original-Received: from webmail1.lanl.gov (localhost.localdomain [127.0.0.1]) by webmail1.lanl.gov (8.12.11.20060308/8.12.11) with ESMTP id l8AJIb5E024658; Mon, 10 Sep 2007 13:18:37 -0600 Original-Received: (from apache@localhost) by webmail1.lanl.gov (8.12.11.20060308/8.12.11/Submit) id l8AJIawA024652; Mon, 10 Sep 2007 12:18:36 -0700 X-Authentication-Warning: webmail1.lanl.gov: apache set sender to herring@lanl.gov using -f Original-Received: from 128.165.123.18 (SquirrelMail authenticated user 196434) by webmail.lanl.gov with HTTP; Mon, 10 Sep 2007 12:18:36 -0700 (PDT) In-Reply-To: <85bqcbnx30.fsf@lola.goethe.zz> User-Agent: SquirrelMail/1.4.8-6.el3.2lanl X-Priority: 3 (Normal) Importance: Normal X-CTN-5-MailScanner-Information: Please see http://network.lanl.gov/email/virus-scan.php X-CTN-5-MailScanner: Found to be clean X-CTN-5-MailScanner-From: herring@lanl.gov X-Detected-Kernel: Linux 2.4-2.6 X-Detected-Kernel: Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:78503 gmane.emacs.pretest.bugs:19829 Archived-At: > Well, seems I misread the manual page for open/creat. I thought that > without O_EXCL, the file would get replaced. > > Well, then there still is the contorted way of hard linking /tmp/foo > to /tmp/foo~, opening /tmp/randomfilename for write, renaming it to > /tmp/foo and then finishing the write operation. Why not just rename /tmp/foo to /tmp/foo~, then open /tmp/foo with O_EXCL? If it fails, then write (again with O_EXCL) to /tmp/randomfile so that the user's work is on disk -somewhere-, and tell them that they have enemies. Davis -- This product is sold by volume, not by mass. If it appears too dense or too sparse, it is because mass-energy conversion has occurred during shipping.